Formation of Aluminum Phosphates by the Reaction of Diphosphorus Pentaoxide (H-, O- and O'-form) with Aluminum Hy d roxide

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Other Title
  • 五酸化ニリン(H型,0型および0' 型)と水酸化アルミニウムとの反応によるリン酸アルミニウムの生成

Abstract

The reaction of aluminum hydroxide [Al(OH)3] with diphosphorus pentaoxide [P2O5(H-, - and O'-form)] has been studied to clarify the conditions of formation of various Oaluminum phosphates and the role of hydroxyl group contained in Al(OH)3.<BR>(1) The species of aluminum phosphate and their amou nts largely depended on the heating temperature, heating time and the molar ratio (R) of P2O5 to A1(OH)3. Aluminum orthophosphate [A1PO4 (berlinite and cristobalite form)] and metaphosphate [Al(PO3)3 (A-form)]were formed at R=1/2. Triphosphate [A1H2P3O10 (I-form)] and Al(PO3)3 (A- and B-form)were mainly produced at R=3/2. The predominant formation of A1(PO3)3 (A-, B- and Eform)was found in the reaction of R=3.<BR>(2) Of three kinds of P2O5, H-form P2O5 had the highest reactivity with Al(OH)3 and the reactivity of O'-form P2O5 was higher than that of O-form P2O5. These results were in good agreement with the tendency of hydrolysis of these three forms of P2O5.<BR>(3) The hydroxide ions in Al(OH)3 are very important to form aluminum phosphate by the reaction of aluminum hydroxide with diphosphorus pentaoxide.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1990 (4), 363-369, 1990-04-10

    The Chemical Society of Japan

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